JP2005008914A - Surface-treatment method of aluminum alloy - Google Patents
Surface-treatment method of aluminum alloy Download PDFInfo
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- JP2005008914A JP2005008914A JP2003171445A JP2003171445A JP2005008914A JP 2005008914 A JP2005008914 A JP 2005008914A JP 2003171445 A JP2003171445 A JP 2003171445A JP 2003171445 A JP2003171445 A JP 2003171445A JP 2005008914 A JP2005008914 A JP 2005008914A
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- JP
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- Prior art keywords
- aluminum alloy
- film
- treatment
- treatment method
- zinc
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/32—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer
- C23C28/322—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer only coatings of metal elements only
- C23C28/3225—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer only coatings of metal elements only with at least one zinc-based layer
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
- C23C28/345—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates with at least one oxide layer
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2222/00—Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
- C23C2222/10—Use of solutions containing trivalent chromium but free of hexavalent chromium
Abstract
Description
【０００１】
【発明の属する技術分野】
本発明は、アルミニウム合金の表面処理技術、特にはクロム酸塩系表面処理技術に関するものである。
【０００２】
【従来の技術】
従来、アルミニウムおよびアルミニウム合金の表面処理（防錆処理）としては、アルマイト処理やアロジン処理等がある。前者のアルマイト処理（陽極酸化皮膜）は電気的な方法であって、同時に任意の色に着色できる利点はあるが高価な設備が必要となる点で比較的にコスト高であり、後者のアロジン処理（一般にはクロム酸塩系が多い）は無電解の化学的な方法（化学皮膜処理）であって、浸漬のみで処理できることから比較的処理操作が簡便なことから比較的に低コストとなり一般的に多く用いられている。また、化学的浸漬法としてはジルコニューム系、フッ化亜鉛系、マンガン系等の皮膜剤もあるが、いずれも高価な処理法となり耐食性効果の点でもよくない。
【０００３】
【特許文献１】
特開平０５−１１７８６８
【０００４】
【発明が解決しようとする課題】
しかしながら、アロジン処理では、有害な六価クロムを酸化防錆用として使用しているために、環境面からも使用が規制されるとともに、その廃液処理に膨大な費用がかかり、従来のようなアロジン処理を続けることは、環境面からも、コスト面からも困難な状況にきているといえる。
【０００５】
そこで、本発明の目的は、アロジン処理法に換わる廉価な、しかも環境にやさしいアルミの表面処理方法を提供する点にある。
【０００６】
【課題を解決するための手段】
本発明の請求項１の発明は、アルミニウム合金に亜鉛置換メッキを用いて被膜形成させ、その形成された皮膜上に三価クロメート皮膜を形成させるアルミニウム及びアルミニウム合金の表面処理方法であり、本発明の請求項２の発明は、請求項１において、前記三価クロメート皮膜上に樹脂皮膜を形成させるアルミニウム合金の表面処理方法である。
【０００７】
本発明の第１の特徴は、アルミニウム合金の表面に先ず亜鉛置換皮膜を形成させ、その上に三価クロメート皮膜を形成させることにある。これによって、アルミニウム合金表面にＡｌ−Ｚｎ−Ｃｒの強固な皮膜が形成され得る。
【０００８】
本発明による上記のＡｌ−Ｚｎ−Ｃｒ皮膜は、アロジン処理法とほぼ同等の耐食性のある皮膜が形成されうることが耐食性試験から確認された。
【０００９】
また、本発明の第２の特徴は、前記皮膜の上にさらにトップコート等の樹脂皮膜を追加使用することにあり、それによってアロジン処理法以上の耐食性を発揮できることが耐食性試験から確認できた。
【００１０】
【発明の実施の形態】
以下、本発明の実施の形態について説明する。
【００１１】
被表面処理用の素材としてアルミダイカストＡＤＣ１２（自動車等において多用されている一般的なアルミ合金）が用いられた。亜鉛置換メッキは上記の素材をメッキ液に浸漬させ素材表面を亜鉛で被覆させるが、このとき用いられる液としては、たとえば、ＩＣ−０３１３（デップソール株式会社製）等があるが、本発明では自社製の改良品（ロッシェル塩、塩化第２鉄入り）を用いた。さらに、亜鉛置換後に三価クロメート処理が施されるが、このとき用いられる三価クロメート液としては、たとえばＺＴ−４４４Ｓ、又はＺＴ−４４４Ａ（デップソール株式会社製）等が用いられる。その後、形成された三価クロメート被膜の防錆や保護を目的としてトップコート等の樹脂被膜をその上に形成させることにより、さらに耐食性のある強固な皮膜を形成させることが出来る。このとき用いられる樹脂コート剤としては、たとえば、ＣＣ−４４５Ｙ（デップソール株式会社製）等が用いられる。本発明の方法によって表面処理されたアルミ合金を用いて耐食性の評価試験が行われた。評価試験方法は塩水噴霧法（ＪＩＳ−Ｚ−２３７１）による。
【００１２】
【実施例】
本発明の方法を用いて、アルミニウム合金表面の防錆処理を行った。基材となるアルミニウム合金はＡＤＣ−１２合金を用いた。亜鉛置換メッキ用のメッキ液としては、ＩＣ−０３１３（デップソール株式会社製）を改良した自社製（ロッシェル塩及び塩化第２鉄入り）の物を用いた。また、三価クロメート処理液としては、ＺＴ−４４４Ａ（デップソール株式会社製）を用いた。上記メッキ液を用いて、アルミニウム合金基材の表面に、先ず亜鉛置換を行い、続いて三価クロメート処理を行った。さらに、この上にトップコート剤（ＣＣ−４４５Ｙ）を用いて、樹脂コーティングを行った。上記のようにして得られた本発明の防錆処理皮膜に対して、耐食性試験をＪＩＳ−Ｚ−２３７１に準じて行った。結果を表１に示す。
【００１３】
なお、比較例として（３）ＡＤＣ−１２基材（皮膜処理なし品）、（４）三価クロメート処理のみ品、（５）亜鉛置換処理のみ品、（６）アロジン処理品、（７）ジルコニューム系液処理品、（８）フッ化亜鉛系液処理品、についても同様の評価試験を行ったので、表１に示す。
【００１４】
表１。耐食性評価試験結果（ＪＩＳ−Ｚ−２３７１による）、数字は白錆％
【発明の効果】
以上説明のごとく、本発明は、アルミ合金用表面処理方法において、アルミ合金上に先ず亜鉛置換液を用いて被膜形成させ、その形成された被膜上に三価クロメート被膜を形成させること、さらには、その上に樹脂コートすることにより、耐食性に優れた強固な被膜の形成手段を提供するとともに、環境に有害な六価クロムを使用しない、環境に優しい、かつ廉価な被膜形成方法を提供するものである。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an aluminum alloy surface treatment technique, and more particularly to a chromate surface treatment technique.
[0002]
[Prior art]
Conventionally, surface treatment (rust prevention treatment) of aluminum and aluminum alloy includes alumite treatment and allodyne treatment. The former alumite treatment (anodized film) is an electrical method and has the advantage that it can be colored in any color at the same time, but it is relatively expensive because it requires expensive equipment. (Generally chromate-based) is an electroless chemical method (chemical film treatment), and since it can be treated only by immersion, the treatment operation is relatively simple and the cost is relatively low. Is often used. Further, as chemical immersion methods, there are coating agents such as zirconium type, zinc fluoride type, and manganese type, but all of them are expensive treatment methods and are not good in terms of corrosion resistance.
[0003]
[Patent Document 1]
JP 05-117868 A
[0004]
[Problems to be solved by the invention]
However, in the allodin treatment, harmful hexavalent chromium is used for oxidation and rust prevention. Therefore, the use of the allodine is restricted from the environmental point of view, and the waste liquid treatment is very expensive. It can be said that it is difficult to continue the processing from the environmental and cost viewpoints.
[0005]
Therefore, an object of the present invention is to provide an inexpensive and environmentally friendly surface treatment method for aluminum that can replace the allodin treatment method.
[0006]
[Means for Solving the Problems]
The invention of claim 1 of the present invention is a surface treatment method of aluminum and aluminum alloy in which a coating is formed on an aluminum alloy using zinc displacement plating, and a trivalent chromate film is formed on the formed film. The invention of claim 2 is the aluminum alloy surface treatment method according to claim 1, wherein a resin film is formed on the trivalent chromate film.
[0007]
The first feature of the present invention is that a zinc-substituted film is first formed on the surface of an aluminum alloy, and then a trivalent chromate film is formed thereon. Thereby, a strong film of Al—Zn—Cr can be formed on the aluminum alloy surface.
[0008]
From the corrosion resistance test, it was confirmed that the Al—Zn—Cr film according to the present invention can form a film having corrosion resistance substantially equal to that of the allodin treatment method.
[0009]
In addition, the second feature of the present invention is that a resin film such as a top coat is additionally used on the film, and it has been confirmed from the corrosion resistance test that the corrosion resistance higher than that of the allodin treatment method can be exhibited.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
[0011]
Aluminum die-cast ADC12 (a general aluminum alloy frequently used in automobiles or the like) was used as a material for surface treatment. In zinc displacement plating, the above material is immersed in a plating solution to coat the surface of the material with zinc. Examples of the solution used at this time include IC-0313 (manufactured by Depsol Co., Ltd.). An in-house improved product (with Rochelle salt and ferric chloride) was used. Further, trivalent chromate treatment is performed after zinc substitution. As the trivalent chromate liquid used at this time, for example, ZT-444S, ZT-444A (manufactured by Depsol Co., Ltd.) or the like is used. Thereafter, a resin film such as a top coat is formed thereon for the purpose of rust prevention and protection of the formed trivalent chromate film, whereby a strong film having further corrosion resistance can be formed. As the resin coating agent used at this time, for example, CC-445Y (manufactured by Depsol Co., Ltd.) or the like is used. A corrosion resistance evaluation test was performed using the aluminum alloy surface-treated by the method of the present invention. The evaluation test method is based on the salt spray method (JIS-Z-2371).
[0012]
【Example】
Using the method of the present invention, the rust prevention treatment of the aluminum alloy surface was performed. ADC-12 alloy was used for the aluminum alloy used as a base material. As a plating solution for zinc displacement plating, an in-house product (containing Rochelle salt and ferric chloride) improved from IC-0313 (manufactured by Depsol Co., Ltd.) was used. Moreover, ZT-444A (made by Depsol Co., Ltd.) was used as a trivalent chromate treatment solution. Using the above plating solution, the surface of the aluminum alloy substrate was first subjected to zinc substitution, and then subjected to trivalent chromate treatment. Furthermore, resin coating was performed on this using a topcoat agent (CC-445Y). The corrosion resistance test was performed according to JIS-Z-2371 with respect to the rust-proofing film of the present invention obtained as described above. The results are shown in Table 1.
[0013]
As comparative examples, (3) ADC-12 base material (product without film treatment), (4) product with only trivalent chromate treatment, (5) product with only zinc substitution treatment, (6) product with allodine treatment, (7) zirconium Since the same evaluation test was conducted on the system liquid treated product and (8) zinc fluoride based liquid treated product, the results are shown in Table 1.
[0014]
Table 1. Corrosion resistance evaluation test results (according to JIS-Z-2371), numbers are white rust%
【The invention's effect】
As described above, in the surface treatment method for an aluminum alloy according to the present invention, a film is first formed on the aluminum alloy using a zinc-substituting liquid, and a trivalent chromate film is formed on the formed film. In addition to providing a method for forming a strong coating with excellent corrosion resistance by coating a resin thereon, it also provides an environmentally friendly and inexpensive coating forming method that does not use harmful hexavalent chromium. It is.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003171445A JP2005008914A (en) | 2003-06-17 | 2003-06-17 | Surface-treatment method of aluminum alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003171445A JP2005008914A (en) | 2003-06-17 | 2003-06-17 | Surface-treatment method of aluminum alloy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2005008914A true JP2005008914A (en) | 2005-01-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2003171445A Pending JP2005008914A (en) | 2003-06-17 | 2003-06-17 | Surface-treatment method of aluminum alloy |
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| JP (1) | JP2005008914A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100627380B1 (en) * | 2006-02-02 | 2006-09-25 | 기양금속공업(주) | Aluminium material of chemical coating method that use the trivalent chromate |
-
2003
- 2003-06-17 JP JP2003171445A patent/JP2005008914A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100627380B1 (en) * | 2006-02-02 | 2006-09-25 | 기양금속공업(주) | Aluminium material of chemical coating method that use the trivalent chromate |
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